M-142 Multifunction Calibrator
MEATEST, s.r.o.
86
User Manual v54
System control
The calibrator includes standardized IEEE-488 bus and RS232 serial line. System connectors are located at the
rear panel. For the remote control to work properly, bus parameters must be set in the system menu. For IEEE-
488 bus, address is important (0 to 30 setting range). For RS232 bus, communication speed can be set (150 to
19200 Bd) and software handshake XON/XOFF can be set. The calibrator can be only controlled by one
interface at a time. It is therefore necessary to select one of the interfaces (GPIB/RS232) using the system menu.
IEEE-488 bus properties
The instrument performs the following functions based on GPIB bus commands:
SH1, AH1, T5, L3, RL1, DC1, SR1
The instrument also recognizes the following general commands:
DCL
Device Clear
SDC
Selected Device Clear
EOI
End or Identify Message Terminator
GTL
Go To Local
LLO
Local Lock Out
SPD
Serial Poll Disable
SPE
Serial Poll Enable
RS232 bus properties
To transfer the data using RS232 bus, 8N1 data format is used, i.e. each data word includes 8 bits, no parity and
one stop bit. The communication speed can be set using the system menu. Available values: 150, 300, 600, 1200,
2400, 4800, 9600 and 19200 Bd. Software handshake (communication control) XON/XOFF can be set to control
the transfer of the data through the bus.
RS-232
connector layout
Pin
Label
Direction
Note
2
TXD
output
transmitter
3
RXD
input
receiver
5
GND
-
ground
9-pin connector D-SUB FEMALE
Cable between the calibrator and PC (configuration 1:1)
PC
D-Sub 1 D-Sub 2
M-142
Receiver
2
2
Transmitter
Transmitter
3
3
Receiver
Ground
5
5
Ground
Tab. 17 RS232 connector description
